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The active partition is the partition which is marked as Active in Index table. the status and locations of partitions are stored in MBR(master boot record). The active status tells the system which partition to boot from. System boots from the partition which contains the Operating System(windows XP, 2003.....). So the partition which contains the Operating System is Active partition and it is the Primary partition. So we can call the active partition as Bootable Partition or Primary Partition.
The system partition(a partition where the operating system is installed) is the active partition of the Hard Drive
system partition
System partition
Must be at least a 2 GB partition. System partition.
Information for BIOS: the active partition is the partition from which an operating system (or another boot-loader) should be boot-loaded.
The boot partition
The system partition is the active partition of the hard drive and it contains the OS boot record. The boot partition is the partition where the Windows operating system is stored.
boot partition
First of all boot partition must be active by default or your system will not boot. Second, there is not such thing as a system partition. There is a system disk which is usually located on boot partition. If you are asking about whether you can change size of boot partition in cost of another partition the answer is yes. The best way to do that is to use one utilities designed for such purposes, for instance, Acronis Disk Director.
Active Partition
There are two types of partitions:Primary partition: A primary partition is used to store (and boot) an operating system. You can store user data and applications here, as well. You can have up to four (4) primary partitions on one hard disk drive (HDD) at one time, but only one of those four can be labeled as an active partition (look below).Active partition: An active partition is a partition that has an operating system installed on it and is used to boot your machine. If you have one primary partition, then it's labeled as "active." If you have more than one primary partition, then only one of them is labeled as "active" in a single PC session.